Some common carboxylic acids

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Formic (methanoic) acid Acetic (ethanoic) acid Propionic (propanoic) acid Butyric (butanoic) acid Lactic (hydroxypropanoic) acid Oxalic (ethanedioic) acid Fumaric (E-butenedioic) acid Tartaric (2,3-dihydroxybutanoic) acid Benzoic acid Salicylic acid Octadecanoic acid